From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14CF2C43331 for ; Wed, 13 Nov 2019 08:23:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DE133222D3 for ; Wed, 13 Nov 2019 08:23:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="XwS8f+ot" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727498AbfKMIX5 (ORCPT ); Wed, 13 Nov 2019 03:23:57 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:44408 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727438AbfKMIXe (ORCPT ); Wed, 13 Nov 2019 03:23:34 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1573633413; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:openpgp:openpgp; bh=vqVZDFat0PMM6C+YZWmr17Dxnrkmoud9CsYgAO3Sp2M=; b=XwS8f+ot93SVV3YGkanZlSA8atMEn12wBQDallfbgwh23j9OGBzaE5rPD2T9UFmxot6Fe7 sl6UOMSGVEl8odkxr3exqjTBK30MLI6EwKH4jPpK0Ct91YK1TPye1zx+SKZLE0VkUsorsw Pi541hyvle/rRL9A6wKqArTRn27nhV0= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-410-V2xfqqTWMXivZzUCHoIIkw-1; Wed, 13 Nov 2019 03:23:30 -0500 Received: by mail-wr1-f72.google.com with SMTP id w4so1158255wro.10 for ; Wed, 13 Nov 2019 00:23:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:openpgp:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=5Mx/AGAaP+j6yF2jjolqE4bxLZFV7ALbdD3tA1UDj6I=; b=b7xNtmvYiieIYMcrhVCk5DMKknwaTnYoFAWBX0BObpqHWXibUN5+m/qQnaMx20j98c vXjpWgfTAeLeGkYPgmQLDIX7fTAS2zDw21UB5CFgAk8wXxueso5BO5O8bTJbab0ZbKx6 lUW1iyzckOg95BWkaLsbnXnC8InHhjV6o3u+swM9Hw0cCJra0afWkPdiqUS75Rpqxv9T DrjIkWLSLuWooaIQc9LppoXHLBEyuVRj+0XYE0x1kSKnHXwbTPLDmAQbSkGubGC6O9ti UjMOzC4UDsOyalLQadH2xg8AsAYJDfArzkepidEh+p4ky3s26yklXZmWrgwU95VVNcNs 7QSw== X-Gm-Message-State: APjAAAWMTN73nOl7UNJD2oV9mFpKFk8eGbcy6XWyhSFtD7pzZqC7qsH7 XRkjscMpKpWxz/tleSBQtksFSQLi3zy7Qs9v+loi3juZ4SDmREfuMrAdQAnuHromvhkbawzyWiq Jj85DP66q9AMTYpMYRpKnBCDC X-Received: by 2002:a5d:4f06:: with SMTP id c6mr1555709wru.211.1573633409451; Wed, 13 Nov 2019 00:23:29 -0800 (PST) X-Google-Smtp-Source: APXvYqwiYyk8fUvAknJQ+JRzrcddJ66kvKLs3AvbR+PScIPgNAa903yr90BKUugKeMCMJGwa+X50Yg== X-Received: by 2002:a5d:4f06:: with SMTP id c6mr1555683wru.211.1573633409147; Wed, 13 Nov 2019 00:23:29 -0800 (PST) Received: from ?IPv6:2001:b07:6468:f312:8c9d:1a6f:4730:367c? ([2001:b07:6468:f312:8c9d:1a6f:4730:367c]) by smtp.gmail.com with ESMTPSA id 91sm1952882wrm.42.2019.11.13.00.23.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 Nov 2019 00:23:28 -0800 (PST) Subject: Re: [FYI PATCH 0/7] Mitigation for CVE-2018-12207 To: Jan Kiszka , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Ralf Ramsauer , "Gupta, Pawan Kumar" References: <1573593697-25061-1-git-send-email-pbonzini@redhat.com> <23353382-53ea-8b20-7e30-763ef6df374c@siemens.com> From: Paolo Bonzini Openpgp: preference=signencrypt Message-ID: Date: Wed, 13 Nov 2019 09:23:30 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <23353382-53ea-8b20-7e30-763ef6df374c@siemens.com> Content-Language: en-US X-MC-Unique: V2xfqqTWMXivZzUCHoIIkw-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13/11/19 07:38, Jan Kiszka wrote: > When reading MCE, error code 0150h, ie. SRAR, I was wondering if that > couldn't simply be handled by the host. But I suppose the symptom of > that erratum is not "just" regular recoverable MCE, rather > sometimes/always an unrecoverable CPU state, despite the error code, righ= t? The erratum documentation talks explicitly about hanging the system, but it's not clear if it's just a result of the OS mishandling the MCE, or something worse. So I don't know. :( Pawan, do you? Paolo